adnet, Google identifies every website by the active domain name. Your old website, albeit now redirecting to your new domain, as far as Google is concerned doesn't exist. Most likely Googlebot is yet to complete crawling your new domain, and therefore the content hasn't yet been placed within the page rank algorithm.

Googlebot can take 4-7 days to index new domains, and if you want to, you can speed up the process by:

Submitting your URL to Google.

Implementing tools such as Google Search Console.

Using Google Analytics.

Stuff like this can help both Google and yourself, monitor the index status of your website.

Hope this helps!

Web Applications Developer Been here for 8 years and counting. Visit me at alexmoloney.me.